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| Numerical simulation analysis of high external water pressure effect in Songlin Tunnel of Central Yunnan Water Diversion |
| WANG Xinyue1, WANG Rubin1*, WANG Dan2, XIANG Tianbing3, WANG Peng2, HUANG Wei1, ZHANG Jianping1, XU Weiya1
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1. School of Civil Engineering and Transportation, Hohai University, Nanjing 210098, Jiangsu, China;
2. Yunnan Dianzhong Water Diversion Engineering Co., Ltd., Kunming 650000, Yunnan, China;
3. Kunming Engineering Co., Ltd., Power Construction Corporation, Kunming 650051, Yunnan, China |
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Abstract To investigate the effects of measures such as grouting and lining drainage on high external water pressure acting on lining in deep-buried tunnels, the Songlin Tunnel of Yunnan Central Water Diversion Project was selected as the study object. Numerical simulation calculation was conducted to investigate the variation of the surrounding rock seepage field and lining structure external water pressure under different grouting ring parameters and lining drainage conditions in the deep-buried water diversion tunnel. Based on the results, proposals for optimizing the design of surrounding rock consolidation grouting and lining drainage were presented. The research findings revealed that setting grouting rings and lining drainage holes in the surrounding rock could effectively reduce the external water pressure on the lining structure. The thicker the grouting ring was, the smaller the permeability coefficient was, and the better the water plugging effect was. The more drainage holes in the lining, the smaller the external water pressure on the lining structure, but the safety of the lining should be considered when setting the drainage holes. It was recommended that the grouting ring thickness should be set at 6-8 meters, and the grouting ring conductivity coefficient should be set at 1/60 to 1/40 of the permeability coefficient of the surrounding rock. The number of drainage holes should be set at 2-3, which was a more reasonable design range.
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Received: 04 August 2023
Published: 19 December 2023
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